18344979 has 12 divisors (see below), whose sum is σ = 26669136. Its totient is φ = 12151152.

The previous prime is 18344971. The next prime is 18344983. The reversal of 18344979 is 97944381.

It is not a de Polignac number, because 18344979 - 2³ = 18344971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18344971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5079 + ... + 7904.

It is an arithmetic number, because the mean of its divisors is an integer number (2222428).

Almost surely, 2^18344979 is an apocalyptic number.

18344979 is a deficient number, since it is larger than the sum of its proper divisors (8324157).

18344979 is a wasteful number, since it uses less digits than its factorization.

18344979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13146 (or 13143 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18344979 is about 4283.1038978759. The cubic root of 18344979 is about 263.7378164973.

The spelling of 18344979 in words is "eighteen million, three hundred forty-four thousand, nine hundred seventy-nine".